Before the Story: Rikyu's Design

Sonic is the hero of all of Mobius, as far as we know it. But when he was a child, a strange dream came to him when the most famous hero of all time is in it. Telling Sonic that he needs to find the heart and that he is him reincarnated, the blue hedgehog sets his goals. But what happens when years later when his alternate self, Scourge gets ahold of the heart? Will he die, not becoming his true self, or will he do anything to get the Heart of a Hero back?